# Start-Stop battery Varta F21 12V 80Ah 800A AGM ![Start-Stop battery Varta F21 12V 80Ah 800A AGM](https://baterias.com/374-home_default/battery-varta-f21-agm-12v-80ah-800a.jpg) > Varta F21 Start-Stop battery 12V 80Ah 800A AGM. Official Varta Distributor. SILVER dynamic AGM range. Dimensions 315×175×190 mm, + terminal on the right. **Category:** [Car batteries equipped with start stop system](https://baterias.com/gb/car-batteries-equipped-with-start-stop-system) → [VARTA](https://baterias.com/gb/varta) - **Canonical URL**: https://baterias.com/gb/battery-varta-f21-agm-12v-80ah-800a - **Language**: en-GB - **Brand**: VARTA - **Reference**: BCOM-VARTA-F21 - **EAN**: 4016987144510 - **MPN**: F21 - **Price**: 147,30 € - **Stock**: In stock ## Technical specifications | Feature | Value | |---|---| | Brand | VARTA | | Reference | F21 | | Model | Dynamic AGM (antes Silver Dynamic AGM) | | Voltage (V) | 12 V | | Largo | 315 mm | | Ancho | 175 mm | | Alto | 190 mm | | Peso | 22.76 kg | | Tecnología | AGM | | EAN | 4016987144510 | | Terminal layout | Positive terminal on the right | | Terminal type | 1 | | Hold down | B13 | | Cold cranking amps (EN) | 800 A | | Capacity (C20) | 80 Ah (c20) | | ETN | 580901080D852 | ## Quick description **Varta F21 12V 80Ah 800A** is a battery designed specifically for Start-Stop vehicles. Withstands up to 3× more start cycles than a conventional battery and maintains performance with BMS and regenerative braking systems. ## Why this Start-Stop battery? - **Designed for Start-Stop** built for the intensive cycling of modern cars - **2 to 3 times longer life** vs fitting a cheap conventional battery - **Fast recovery** recharges in minutes once the engine is running 🔌 Voltage 12 V ⚡ Capacity 80 Ah C20 🔋 Cold cranking 800 A EN-1 📏 Dimensions 315×175×190 mm ⚙️ Technology AGM 🧭 Polarity Positive on the right ⚖️ Weight 22,76 kg 🏷️ Model SILVER dynamic AGM ## Description ## Varta F21 Dynamic AGM (formerly Silver Dynamic AGM) 80Ah 800A 12V Car Battery 12*V* Voltage 80*Ah* Capacity 800*A* Cold cranking 22.76*kg* Weight The **Varta F21 car battery** is the **12 V**, **80 Ah** model delivering **800 A** of cold cranking power (EN), from Varta's **Dynamic AGM (formerly Silver Dynamic AGM)** range, designed for cars with a Start-Stop system and high electrical demand. It replaces the original battery in cars with the 315 × 175 × 190 mm format without any modifications: the same 80 Ah capacity and the same terminal layout (positive on the right). - Reinforced resistance to the partial charges and discharges of daily use. - More guaranteed starts than a conventional battery. - Built for the intensive cycling of the Start-Stop system. - Keeps the vehicle's electronic management correctly calibrated. ### Applications of the Varta F21 battery With 80 Ah, the Varta F21 is sized for cars with a Start-Stop system and high electrical demand, as a direct replacement for the original battery. Check that it matches your current battery in dimensions, terminals and hold-down: this reference weighs 22.76 kg and has terminal 1 and a B13 hold-down. ### Format and fitting of the Varta F21 The Varta F21 is made in the 315 × 175 × 190 mm format and weighs 22.76 kg. The positive terminal on the right determines which side the cables end up on: this is the detail behind more wrong purchases than any other, so it is worth checking before you order. It takes a B13 hold-down and terminal 1, the system that anchors it to the vehicle's battery tray. Before replacing it, measure the space your current battery occupies: if it matches on all three dimensions and on terminal position, the swap is direct and needs no adapters. ### The Varta F21 and the Dynamic AGM range The **Dynamic AGM** range (gold label) is Varta's flagship for cars: AGM technology, with the electrolyte absorbed in glass fibre, designed for the most advanced Start-Stop systems and for regenerative braking. It withstands thousands of charge and discharge cycles without losing performance and is the only correct choice when the car came with AGM from the factory. Ideal for vehicles with high electrical consumption and very frequent starts. The difference from a conventional battery lies in the construction: separators and plates built for thousands of partial charge and discharge cycles. Fitting a standard battery to a car with Start-Stop drastically shortens its life; this range avoids that mistake and keeps the fuel-saving system working. *This battery used to belong to Varta's **Silver Dynamic AGM** range; following the brand's commercial renaming (2025), it now forms part of the new **Dynamic AGM** series.* ### Why choose a Varta battery Varta is an original equipment (OEM) supplier to a good share of Europe's car manufacturers: many cars leave the factory with a Varta fitted. Buying a replacement means, in most cases, refitting the original battery with the same quality and the brand's official warranty. Varta combines more than a century of experience with Clarios's industrial production: it is the battery many manufacturers choose as standard and one of the most recommended by workshops. Like any lead-acid battery, it is 100% recyclable. Varta is Europe's leading manufacturer of starter batteries: its production volume and quality controls guarantee consistent reliability batch after batch, something own-brand makes cannot always promise. ### Manufacturer's warranty The Varta F21 battery comes with the **official manufacturer warranty**. ### Care and maintenance In a Start-Stop vehicle the battery works much harder, so it pays to drive far enough for it to recharge and to always replace it with the same type (AGM for AGM, EFB for EFB) so as not to throw the electronic management out of calibration. For it to perform at its best, avoid overly short journeys, which stop it recharging after each start. Keeping the terminals clean and the hold-down secure prevents failures caused by vibration in the engine bay. ### Technical sheet Download the official technical sheet for this battery with all the manufacturer data. [Download technical sheet (PDF)](/fichastecnicas/data-sheet-battery-varta-f21-80ah-800a-12v-en.pdf) ## Frequently asked questions ### Is the Varta F21 an AGM battery and what are the benefits of AGM? Yes. The F21 from Varta uses AGM (Absorbent Glass Mat) technology: a sealed lead-acid battery where the electrolyte is absorbed in a glass-fibre mat. It withstands more charge/discharge cycles than a conventional one, handles heat better and is the required technology for cars with advanced Start-Stop and regenerative braking. Expected lifespan: 5-8 years under normal conditions. ### Is the Varta F21 battery suitable for Start-Stop? Yes. As AGM technology it is designed for Start-Stop vehicles. AGM batteries support advanced Start-Stop and regenerative braking thanks to their higher cycle count. EFB is recommended for basic Start-Stop; AGM is recommended when regenerative braking is also present, thanks to its higher cycle capability. It works straight out of the box — on most modern vehicles registering the battery via OBD is recommended so the alternator automatically applies the optimal charging profile. ### How is the Varta F21 battery installed in the vehicle? In most cars it fits in 15-30 minutes with a 10 mm wrench; if the battery is under the seat or in the boot the time can double. See the step-by-step guide on this page. Quick summary: 1) switch off the engine and remove the key; 2) locate the original battery (engine bay, boot or under seat); 3) disconnect the negative (−) terminal first, then the positive (+); 4) loosen the hold-down clamp and remove the old battery; 5) fit the new one in the same orientation — match the polarity shown on the product sheet; 6) connect the positive (+) first, then the negative (−). On cars with Start-Stop or BMS, register the battery via OBD so the alternator applies the correct charging profile. ### How long does the Varta F21 battery last? Expected lifespan of the Varta F21 is 5 to 8 years in mild-climate car use with Start-Stop. In cold regions it drops slightly due to cold-start stress; in very hot regions it also drops because of electrolyte evaporation. To extend its life: avoid deep discharges (headlights on with engine off), have the alternator checked yearly, and keep the battery clean and properly secured. ### What are the dimensions of the Varta F21 battery? Dimensions (length × width × height) are 315×175×190 mm — also written as 315x175x190 mm and correspond to the European L4 case size — following the European DIN standard. Always measure the space in your car before buying: even one extra millimetre can prevent the hold-down clamp from closing. The height shown includes the terminals. ### Will the Varta F21 battery fit my car? Three options to confirm: 1) enter your number plate in the finder (DGT/DVLA/KBA auto-detect your model and engine); 2) check the "Compatible vehicles" tab on this page, where we list every vehicle verified by our technical team; 3) if you cannot find your model, message us on WhatsApp with brand, model, engine and year — we reply during business hours (Mon–Fri 10:00–13:30 and 16:40–18:00 (Spanish time, CET)). The F21 typically fits a wide range of European vehicles thanks to its standard DIN case format. ### What are the equivalents of the F21 model? Directly interchangeable batteries (same dimensions, same polarity, same Ah and CCA) are the OEM equivalents from leading brands: Bosch, Tudor, Exide and, depending on the model, Banner or Yuasa. Exact equivalence depends on technology — an EFB cannot be replaced with a conventional battery in Start-Stop cars. See the "Equivalents" section to view recommended options at the same performance level. ### What advantages does the Varta F21 AGM battery offer over an EFB? AGM (Absorbent Glass Mat) technology uses absorbent fibreglass that retains the electrolyte, eliminating leaks and allowing up to 3× more charge/discharge cycles than a conventional battery. It is the recommended option when the car has advanced Start-Stop with regenerative braking (BMW EfficientDynamics, Mercedes Eco, Audi MHEV, Land Rover ECO, Volvo i-Stop). Withstands tilted positions, high vibration and extreme temperatures better than EFB. The Varta F21 is fully original and meets European EN 50342-6 standards for advanced Start-Stop. ### Is there anything to do after replacing a Start-Stop battery? On most cars it is not strictly necessary — the alternator detects the new battery and adapts the charge automatically. It is recommended to register the battery via OBD so that the alternator applies the optimal charging profile from the first minute and extends the battery life as much as possible (especially on brands with sophisticated BMS: BMW, Mercedes, Audi, Volvo, Land Rover). Any workshop with an OBD scanner (~10-15 € labour) does it in 5 minutes. DIY apps: VCDS / Carista (VAG), Bimmercode (BMW), iCarsoft. If you do not register, the car will still start correctly — the alternator just takes a few days to adjust the profile. The Varta F21 ships factory-charged at 80-90% so you can use it straight after fitting. ## Reviews - **Average rating**: 4.8 / 5 (82 reviews) ## Technical team (editorial authorship) The FAQs, guides and comparisons on this site are reviewed by the baterias.com technical team — automotive battery specialists since 2015. → https://baterias.com/gb/technical-team --- *baterias.com — Automotive batteries · 2026-10-12*